<template>
	<view class="search-box">
		<uni-search-bar @confirm="search" @input="input" :radius="100" cancelButton="none"
		:focus="true"></uni-search-bar>
	</view>
	<!-- 搜索建议列表 -->
	<view class="sugg-list" v-if="searchResults.length !== 0">
		<view class="sugg-item"v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
			<view class="goood-name">{{item.goods_name}}</view>
			<uni-icons type="right" size="16"></uni-icons>
		</view>
	</view>
	<!-- 搜索历史 -->
	<view class="history-box" v-else>
		<!-- 标题区域 -->
		<view class="history-title">
			<text>搜索历史</text>
			<uni-icons type="trash" size="20" @click="clean"></uni-icons>
		</view>
		<!-- 列表区域 -->
		<view class="history-list">
			<uni-tag :text="item" v-for="(item,i) in historyList":key="i" @click="gotoGoodsList(item)"></uni-tag>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
			timer:null,
			kw : '',
			// 搜索结果列表
			searchResults:[],
			historyList:[]
			};
		},
		onLoad(){
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods :{
			// input输入事件的处理函数
			input(e){
				clearTimeout(this.timer)
				this.timer = setTimeout(()=>{
					this.kw = e
				this.getSearchList()	
				},500)
				
			},
			async getSearchList(){
				//判别搜索条件是否为空
				if(this.kw.length === 0){
					this.searchResults=[]
					return
				}
			
			//发起请求，获取搜索建议列表
				const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				if(res.meta.status !== 200){
					return uni.$showMsg()
				}
				console.log(res)
				this.searchResults = res.message
				
				this.saveSearchHistory()
				
			},
			// 跳转到商品详情页
			gotoDetail(item){
				
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				
				this.historyList = Array.from(set)
				
				// 对搜索历史数据，进行持久化的存储
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList = []
				uni.setStorageSync('kw', '[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query='+kw
				})
			}
			
		},
		computed:{
			histories(){
				return [...this.historyList].reverse()
			}
		}
		
	}
</script>

<style lang="scss">
.search-box{
	position: sticky;
	top: 0%;
	z-index: 999;
}
.sugg-list{
	padding: 0 5px;
}
.sugg-item{
	font-size: 12px;
	padding: 13px 0;
	display: flex;
	// 横向居中
	text-align: center;
	// 纵向居中
	justify-content: space-between;
	border-bottom: 1px solid #efefef;
}
.goood-name{
	// 文字不允许换行
	white-space: nowrap;
	// 隐藏多余类容
	overflow: hidden;
	// 多余类容已...结尾
	text-overflow: ellipsis;
}
.history-box{
	padding: 0 5px;
}
.history-title{
	display: flex;
	justify-content: space-between;
	height: 40px;
	align-items: center;
	font-size: 13px;
	border-bottom: 1rpx solid #efefef;
}
.history-list{
	
}
.uni-tag{
	margin-top: 5px;
	margin-right: 5px;
}
</style>